In the future, we want to potentially be able to display multiple chat areas at a time (for splitscreen, for user-user chat, etc).  The convention that I was using is:

"Current" - Means that a room is visible
"Active" - Means that the room has focus

That is, in the future, multiple rooms could be 'current' and we could update logic to only ensure that messages are added to the dom or otherwise displayed on current rooms.  A maximum of 1 room can be active at a time however (when we send messages to the server (even commands, which might come from some alternative UI), they're associated with a room)

Happy for any convention, but that's what my split of Active/Current was working towards.